US8040841B2 - Wireless communication system, wireless terminal and wireless base station - Google Patents

Wireless communication system, wireless terminal and wireless base station Download PDF

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US8040841B2
US8040841B2 US12/182,508 US18250808A US8040841B2 US 8040841 B2 US8040841 B2 US 8040841B2 US 18250808 A US18250808 A US 18250808A US 8040841 B2 US8040841 B2 US 8040841B2
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wireless
base station
network
communication
wireless terminal
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US20090034497A1 (en
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Tomohiro Ono
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NEC Corp
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NEC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a WiMAX (Worldwide Interoperability for Microwave Access) [IEEE 802.16a] system, and a wireless terminal and a wireless base station used for the system.
  • WiMAX® is one of standards of radio communication technology, and is a generic term for technology that is standardized by the IEEE 802.16 working group and the WiMAX Forum® which is an industry organization.
  • a communication area is smaller in Up Link communication than in Down Link communication. This is caused by problems of asymmetry of transmission powers or transmission and reception timing between a WiMAX base station and a WiMAX-embedded wireless terminal.
  • a WiMAX base station receives a CDMA Ranging Request from a WiMAX-embedded wireless terminal (MS), and notifies WiMAX-embedded wireless terminal 4 of respective adjusted values of power, timing and frequency in a Ranging Response.
  • the WiMAX base station notifies the WiMAX-embedded wireless terminal of Ranging completion in a Ranging Response.
  • the terminal repeats transmission of a CDMA Ranging Request to the WiMAX base station for a prescribed number of times by referring to adjusted values notified in the Ranging Response by the WiMAX base station. In this manner, the terminal adjusts the respective parameters of power, timing and frequency.
  • the WiMAX base station cannot notify the WiMAX-embedded wireless terminal of the Ranging completion, that is, it cannot adjust a value of any of the parameters even by adjusting prescribed number of times. If the parameters cannot be adjusted, Network Entry fails, so that the WiMAX-embedded wireless terminal cannot get service in Down Link or Up Link.
  • One cause why respective parameters cannot be adjusted to be within permissible ranges in a CDMA Ranging Request by a prescribed number of times includes, for example, that the transmission power of the WiMAX-embedded wireless terminal is lower than the transmission power of the WiMAX base station.
  • a WiMAX-embedded wireless terminal is often used with information equipment such as a PC, or used independently as a mobile phone terminal. In either case, the WiMAX-embedded wireless terminal needs to be operated in a power-saving mode. As such, power consumption of the WiMAX-embedded wireless terminal even when operating at maximum power is lower than that of a WiMAX base station.
  • the WiMAX-embedded wireless terminal cannot often gain a sufficient receiving electric field in Up Link, in which the WiMAX-embedded wireless terminal is a transmitter, even in an area where in Down Link, in which the WiMAX base station is a transmitter, the WiMAX-embedded wireless terminal can receive a signal in a preferable state in which it can gain a sufficient receiving electric field.
  • Another cause includes the following.
  • Timing is adjusted in addition to the power. Accordingly, in Up Link, when a WiMAX base station receives the signals transmitted from WiMAX-embedded wireless terminals, if the respective signals are received at different times, interference is caused among Subchannels, thereby causing a great influence on demodulation.
  • a WiMAX-embedded wireless terminal identifies the head of a Down Link Subframe in Preamble, so that a delay due to propagation causes no problem.
  • a WiMAX base station defines the head of an Up Link Subframe by a TTG (Transmit/Receive Transition Gap) from the end of a Down Link Subframe. As such, if a delay due to propagation is too long, a WiMAX base station can not receive a CDMA Ranging Request.
  • the invention disclosed in Japanese Patent Laid-Open No. 2006-196985 has the problem in which there is a need to invest in equipment for installing a relay.
  • a technique for Down Link communication includes “Communication System” disclosed in Japanese Patent Laid-Open No. 2003-153238, or “Radio Communication System and Retransmission Control Method Thereof” disclosed in Japanese Patent Laid-Open No. 8-274758.
  • a Down Link service is limited to a broadcast channel according to the invention disclosed in Japanese Patent Laid-Open No. 2003-153238, so that it is difficult to apply the invention to Down Link services other than the broadcast channel.
  • a wireless communication system includes at least one wireless terminal and one wireless base station, the wireless terminal being connected to the wireless base station via a wireless network and a heterogeneous network which is an arbitrary communication network different from the wireless network, wherein
  • a wireless communication system includes at least one wireless terminal and one wireless base station, the wireless terminal being connected to the wireless base station via a wireless network and a heterogeneous network which is an arbitrary communication network different from the wireless network, wherein
  • a wireless terminal which is connected to a wireless base station via a wireless network and via a heterogeneous network which is an arbitrary communication network different from the wireless network, includes:
  • a wireless base station which is connected to at least one wireless terminal via a wireless network and via a heterogeneous network which is an arbitrary communication network different from the wireless network, includes:
  • FIG. 1 is a diagram showing a sequence of a Ranging Request by a WiMAX-embedded wireless terminal and a response to the request by a WiMAX base station;
  • FIG. 2 is a pattern diagram showing the relation between an area where Up Link communication is possible and an area where only Down Link communication is possible;
  • FIG. 3 is a block diagram showing the configuration of a WiMAX system according to a first exemplary embodiment of the present invention
  • FIG. 4 is a diagram showing a sequence of Network Entry and data path generation in the WiMAX system shown in FIG. 3 ;
  • FIG. 5 is a block diagram showing the functional configuration of a WiMAX-embedded wireless terminal
  • FIG. 6 is a block diagram showing the functional configuration of a WiMAX base station
  • FIG. 7 is a flowchart showing procedures of Network Entry and data path generation if a WiMAX-embedded wireless terminal is in an area where only Down Link service can be provided;
  • FIG. 8 is a diagram showing a transmission sequence of a Spare Capacity Request, a Spare Capacity Report and a Neighbor BS Resource Status Update;
  • FIG. 9 is a diagram showing a sequence of delivery of a BSID and an MSID from the CA to a WiMAX-embedded wireless terminal and to a WiMAX base station;
  • FIG. 10 is a diagram showing a communication sequence if both Down Link and Up Link are made through a heterogeneous network and a CSN;
  • FIG. 11 is a block diagram showing the configuration of a WiMAX system according to another exemplary embodiment of the present invention.
  • a WiMAX system in the outside of area 1 where Down Link and Up Link communication are possible, there is area 2 where only Down Link communication is possible, as shown in FIG. 2 .
  • a WiMAX system according to this exemplary embodiment is to provide only a Down Link service in an area where only Down Link communication is possible so that the respective parameters of the received power and reception timing are sufficient in Down Link, but the respective parameters of the received power and reception timing are insufficient in Up Link.
  • Heterogeneous network 9 is a communication network such as a third generation mobile phone network, a second generation mobile phone network such as PDC (Personal Digital Cellular) or GSM (Global System for Mobile Communications), a PHS (Personal Handy-Phone System) network, a fixed telephone network, a wireless LAN (Local Area Network), or a wired LAN.
  • a device which is connected to the heterogeneous networks (heterogeneous network communicator 104 discussed later), and a WiMAX communication device (WiMAX communicator 103 discussed later) are mounted on WiMAX-embedded wireless terminal 4 . These devices may be dual devices or multiple devices.
  • CA 6 is a certificate authority for certificating WiMAX-embedded wireless terminal 4 for accessing WiMAX base station 3 via heterogeneous network 9 .
  • ASN-GW (Access Service Network-Gateway) 5 connects a first network in which CA 6 being a certificate authority is installed (CSN 8 ) and a second network in which WiMAX base station 3 is installed (ASN 7 ).
  • ASN-GW 5 can manage all WiMAX base stations 3 and can deliver the management information to each WiMAX base station 3 and to CA 6 at pre-determined intervals.
  • WiMAX base station 3 and WiMAX-embedded wireless terminal 4 directly negotiate with each other.
  • WiMAX base station 3 and WiMAX-embedded wireless terminal 4 do not directly negotiate with each other, but WiMAX base station 3 and WiMAX-embedded wireless terminal 4 negotiate with each other through heterogeneous network 9 and CA 6 of CSN 8 .
  • CDMA Ranging if CDMA Ranging is not completed, the WiMAX system performs Network Entry and data path generation according to a sequence flow shown in FIG. 4 .
  • No completion of CDMA Ranging herein means that parameters such as power or timing cannot be adjusted within the prescribed number of times.
  • a management message includes all WiMAX management messages other than Ranging, such as SS Basic Capability, Registration or Privacy Key Management, for example.
  • FIG. 5 shows the functional configuration of WiMAX-embedded wireless terminal 4 .
  • WiMAX-embedded wireless terminal 4 includes controller 101 , parameter adjuster 102 , WiMAX communicator 103 and heterogeneous network communicator 104 .
  • Controller 101 controls operation for communication with WiMAX wireless base station 3 of WiMAX-embedded wireless terminal 4 .
  • Parameter adjuster 102 extracts adjusted value information contained in a Ranging Response received from WiMAX wireless base station 3 via a WiMAX network, and adjusts parameters for WiMAX communication based on the extracted information.
  • WiMAX communicator 103 is a function unit for transmitting and receiving information via the WiMAX network.
  • Heterogeneous network communicator 104 is a function unit for transmitting and receiving information via heterogeneous network 9 .
  • a plurality of heterogeneous network communicators 104 can be implemented for two or more communication networks.
  • FIG. 6 shows the functional configuration of WiMAX base station 3 .
  • WiMAX wireless base station 3 includes controller 201 , parameter determiner 202 , adjusted value generator 2021 , WiMAX communicator 203 and network communicator 204 .
  • Controller 201 controls operation for communication with WiMAX-embedded wireless terminal 4 of WiMAX base station 3 .
  • Parameter determiner 202 analyzes a Ranging Request received from WiMAX-embedded wireless terminal 4 via the WiMAX network, and determines whether or not a parameter in a received signal is within a pre-determined range. If the parameter is not within the pre-determined range, parameter determiner 202 causes adjusted value generator 2021 to generate an adjusted value to set the parameter of the Ranging Request in the pre-determined range.
  • WiMAX communicator 203 is a function unit for transmitting and receiving information via the WiMAX network.
  • Network communicator 204 is a function unit for transmitting and receiving information via ASN (Access Service Network) 7 .
  • WiMAX-embedded wireless terminal 4 If WiMAX-embedded wireless terminal 4 is in area 2 where only the Down Link service is possible, as shown in FIG. 2 , WiMAX-embedded wireless terminal 4 performs Network Entry processing and data path generation processing according to the flow shown in FIG. 7 .
  • WiMAX-embedded wireless terminal 4 is in an environment in which it can receive and demodulate WiMAX OFDMA (Orthogonal Frequency Division Multiple Access) signals transmitted periodically from WiMAX base station 3 by using WiMAX communicator 103 and in which it can decode DL-MAP and UL-MAP.
  • WiMAX-embedded wireless terminal 4 performs Network Entry, it receives the DL-MAP and UL-MAP from WiMAX base station 3 via the WiMAX network (step S 1 ).
  • controller 101 of WiMAX-embedded wireless terminal 4 When controller 101 of WiMAX-embedded wireless terminal 4 receives the DL-MAP and UL-MAP from WiMAX base station 3 , it transmits a CDMA Ranging Request to WiMAX base station 3 using WiMAX communicator 103 (step S 2 ).
  • controller 201 of WiMAX base station 3 transmits a Ranging Response to WiMAX-embedded wireless terminal 4 using WiMAX communicator 203 to notify WiMAX-embedded wireless terminal 4 of the Ranging completion, as shown in FIG. 1 (step S 9 ). Then, controller 201 of WiMAX wireless base station 3 and controller 101 of WiMAX-embedded wireless terminal 4 perform Network Entry processing (which provides both DL and UL communication services) which has been performed in a general WiMAX system (step S 10 ).
  • controller 101 of WiMAX-embedded wireless terminal 4 uses heterogeneous network communicator 104 to access CA 6 via heterogeneous network 9 , as in the sequence shown in FIG. 4 (step S 4 ).
  • WiMAX base station 3 cannot receive a CDMA Ranging Request and WiMAX base station 3 cannot transmit a Ranging Response due to the problem of distance or delay. If condition (b) is met, WiMAX base station 3 , that has received a CDMA Ranging Request, repeatedly transmits a Ranging Response containing adjusted value information to WiMAX-embedded wireless terminal 4 for a prescribed number of times but WiMAX-embedded wireless terminal 4 cannot adjust the value.
  • Controller 101 of WiMAX-embedded wireless terminal 4 obtains a BSID (base station identifier) of WiMAX base station 3 from DL-MAP.
  • Terminal 4 uses heterogeneous network communicator 104 to transmit information of the BSID and an MSID (mobile station identifier) of wireless terminal 4 itself to CA 6 through heterogeneous network 9 (step S 5 ).
  • ASN-GW 5 transmits a Spare Capacity Request to WiMAX base stations 3 in GW 5 for RRM (Ratio Resource Management) at each pre-determined time interval, as shown in FIG. 8 .
  • Controller 201 of WiMAX base station 3 that has received the Spare Capacity Request uses network communicator 204 to transmit Spare Capacity Report to ASN-GW 5 .
  • the Spare Capacity Report contains BSID information.
  • ASN-GW 5 transmits Neighbor BS Resource Status Update containing all information of WiMAX base stations 3 in GW 5 to all WiMAX base stations 3 in GW 5 .
  • ASN-GW 5 transmits the Neighbor BS Resource Status Update not only to WiMAX base station 3 , but also to CA 6 (step S 6 ). This operation is different from an existing system.
  • CA 6 searches for the BSIDs inputted from WiMAX-embedded wireless terminal 4 based on the Neighbor BS Resource Status Update information received from ASN-GW 5 , and identifies ASN-GW 5 which manages WiMAX base stations 3 (step S 7 ).
  • CA 6 conveys MSID information to WiMAX base station 3 through ASN-GW 5 .
  • CA 6 notifies WiMAX-embedded wireless terminal 4 that WiMAX base station 3 has been found and negotiation is possible using a WiMAX management message.
  • Controller 101 of WiMAX-embedded wireless terminal 4 performs negotiation for SS Basic Capability, Registration, Privacy Key Management or data path generation, and establishes a connection to get Down Link service as necessary. Controller 101 also performs negotiation to get MBS (Multicast Broadcast Service) as necessary (step S 8 ).
  • MBS Multicast Broadcast Service
  • the WiMAX system provides only a Down Link service in an area where the strength of the received power is sufficient for Down Link but the adjusted value of the received power or timing is insufficient for Up Link so that only Down Link communication is possible, thereby expanding a communication area.
  • an MBS does not assign a Down Link band to each WiMAX-embedded wireless terminal 4 that is connected, but assigns the same Down Link band to all WiMAX-embedded wireless terminals 4 for the service in the area where only Down Link communication is possible, thereby improving band usability.
  • WiMAX-embedded wireless terminal 4 can include an interface unit connected to another apparatus, for example, a PC (Personal Computer) or a PDA (Personal Digital Assistant).
  • a PC Personal Computer
  • PDA Personal Digital Assistant
  • WiMAX-embedded wireless terminal 4 can use the communication function of the other apparatus connected to the interface unit to access CA 6 through heterogeneous network 9 similarly to the case in which terminal 4 is equipped with multiple access devices.
  • a second exemplary embodiment of the present invention will be described.
  • the configuration of a WiMAX system is basically similar to that of the first exemplary embodiment.
  • WiMAX-embedded wireless terminal 4 acknowledges a BSID of WiMAX base station 3 , negotiation is performed using a management message for Network Entry other than Ranging.
  • WiMAX base station 3 and WiMAX-embedded wireless terminal 4 do not directly negotiate with each other, but WiMAX base station 3 and WiMAX-embedded wireless terminal 4 negotiate with each other through heterogeneous network 9 and CA 6 of CSN 8 .
  • Controller 101 of WiMAX-embedded wireless terminal 4 can determine whether or not the strength of receiving electric field in Down Link is insufficient in an area based on RSSI (Received Signal Strength Indication). Controller 101 can also determine that the strength of the receiving electric field in Down Link is insufficient when the number of times, at which the intensity of the receiving voltage is below a predetermined threshold, reaches a prescribed value.
  • RSSI Receiveived Signal Strength Indication
  • the BSID of an area where individual live such as a home or a frequently used location where the strength of the received power in Down Link is sufficient, is previously registered.
  • a third exemplary embodiment of the present invention will be described.
  • the configuration of a WiMAX system is similar to that of the first exemplary embodiment.
  • controller 201 of WiMAX base station 3 assigns the same Down Link band to all WiMAX-embedded wireless terminals 4 in an area where only Down Link communication is possible for the MBS.
  • An MBS includes a Single BS MBS and a Multi BS MBS, to both of which this exemplary embodiment can be applied.
  • a service using the MBS includes a broadcast channel, for example.
  • controller 101 of WiMAX-embedded wireless terminal 4 accesses an application server (not shown) on CSN 8 through heterogeneous network 9 and CSN 8 without using Up Link of the WiMAX system.
  • the application server changes the content depending on a change request by controller 101 .
  • FIG. 11 shows the configuration of a WiMAX system comprising an accounting apparatus for performing such accounting processing.
  • accounting apparatus 10 is added to the configuration shown in FIG. 3 .
  • Accounting apparatus 10 is connected to CA 6 via a network for mutual communication.
  • CA 6 retains a certification record when WiMAX-embedded wireless terminal 4 performs upstream communication via heterogeneous network 9 .
  • CA 6 transmits the retained certification record to accounting apparatus 10 depending on a request by accounting apparatus 10 .
  • Accounting apparatus 10 performs accounting processing on WiMAX-embedded wireless terminal 4 based on the certification record supplied from CA 6 . In this manner, accounting processing can be performed for upstream communication from WiMAX-embedded wireless terminal 4 to WiMAX base station 3 via heterogeneous network 9 .
  • WiMAX-embedded wireless terminal 4 transmits a CDMA Ranging Request as a ranging signal to WiMAX base station 3 to establish communication with WiMAX base station 3 .
  • WiMAX base station 3 sends back a response signal (Ranging Response) that includes completion notification if a communication parameter of the ranging signal is within a pre-determined range, or that includes adjusted value information if the parameter is not within the pre-determined range to WiMAX-embedded wireless terminal 4 via the WiMAX network.
  • a communication parameter herein includes at least one of the following parameters of a response signal: power, timing or frequency.
  • the invention is not limited to a WiMAX system.
  • the invention may be applied to general wireless communication systems represented by a mobile system, a PHS system, a wireless LAN (for example, Wi-Fi) or the like.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)
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JP2007-197513 2007-07-30
JP2007197513A JP2009033632A (ja) 2007-07-30 2007-07-30 ＷｉＭＡＸシステム、無線端末及び無線基地局

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CN101431804B (zh) 2014-12-10
EP2028896A2 (en) 2009-02-25
TW200922346A (en) 2009-05-16
TWI383704B (zh) 2013-01-21

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